inauspicious

The word 'inauspicious' is a direct negation of 'auspicious'. Its core, 'auspicious', originates from the Latin auspicium, a compound of avis (bird) and specere (to look, observe). In ancient Roman religion, an augur would observe the flight patterns of birds to divine the favor of the gods, making an 'auspice' an omen. The adjective 'auspicious' thus came to mean 'characterized by favorable omens'. By adding the Latin negative prefix in-, the word 'inauspicious' was formed to describe a situation or beginning that lacks favorable signs, carrying the sense of being ill-omened or unlikely to succeed. The modern meaning has evolved from this literal practice of divination to a more general abstract sense of being unfavorable or unpromising.

Structure: in (not) + auspicious (favorable) in- (Latin origin, a prefix meaning 'not'); auspicious (from Latin auspicium, meaning 'omen', specifically from bird divination, with the suffix -ious forming an adjective meaning 'full of' or 'characterized by').